Coordinates.
These may be Cartesian - ie distance from the origin in mutually perpendicular (orthogonal) directions.
Or they may be polar. Polar coordinates consists of the length of the line joining the point to the origin together with the angles that the line makes with the various principal planes (or hyperplanes).
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Ordered Pair
ordered pair
a pair of numbers used to locate a point on a coordinate plane
Ordered pairs are used to locate points on the coordinate plane.
The horizontal x axis and the vertical y axis which intersect at right angles at the point of origin (0, 0) are use to plot points on the coordinated plane.